Mobile device screen or portion thereof with an animated graphical user interface



FIG. 1 is a front view of a mobile device screen or portion thereof with an animated graphical user interface showing the first image in a sequence;

FIG. 2 is the second image thereof,

FIG. 3 is the third image thereof; and,

FIG. 4 is the fourth image thereof.

The outermost broken lines show a mobile device screen or portion thereof. The other broken lines, including the slashed line text, show portions of the graphical user interface. None of the broken lines form part of the claimed design.

The appearance of the animated graphical user interface sequentially transitions between the images shown in FIGS. 1-4. The process or period in which one image transitions to another forms no part of the claimed design. 

CLAIM The ornamental design for a mobile device screen or portion thereof with an animated graphical user interface, as shown and described. 